Edexcel Gcse Spanish Grades

I am doing edexcel exam board for spanish and we have 60% cntrolled assessments, so I was wondering what I need to get in each controlled assessment and the exam to come out with an A* overall? Does anyone that has done this board or is doing it know? Please help, I am practising for a spanish writing exam and am struggling to remember it so I feel I won't get an A*.